I'd do a full 30 day hypo at 1.009. It won't hurt the fish, provided you go slow and keep the pH up to a reasonable level, so there's no downside other than a few weeks of work. And PBT's are *so* prone to stress and illnes, I think it's worth the effort.
Anything higher than 1.009 and you won't kill any possible ick; anything less gets too stressful for the fish.
I have a Powder Blue Tang for almost 5 years now. Wonderful fish and eats anything I put in. I have about a dozen of other fish in my tank and last year I added a newly purchased fish (did not quarantine) and the only fish that came down with ich was my PBT.
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